A123366 Primes of the form 10*(10^(x+1)+10^x-1)+7.

1097, 1099997, 10999997, 1099999997, 1099999999999999999999997, 10999999999999999999999997, 1099999999999999999999999999999999999999997, 10999999999999999999999999999999999999999999999999999999999999999997

Offset

1,1

Comments

10(10^803+10^802-1)+7 is the largest PRP with less than 1000 digits.

Links

Table of n, a(n) for n=1..8.

Prog

(PARI) g(n) = for(x=1, n, y=10*(10^(x+1)+10^x-1)+7; if(ispseudoprime(y), print1(y", ")))

Crossrefs

Sequence in context: A184470 A234722 A160370 * A186476 A096926 A249287

Adjacent sequences: A123363 A123364 A123365 * A123367 A123368 A123369

Keyword

nonn

Author

Cino Hilliard, Oct 12 2006

Status

approved